Well maintained 445 (Kawasaki 22 hp) with 1040 hrs; recently noticed that when I go down a long downhill driveway at full throttle that the engine hesitates all the way down approx. every 3 seconds repeatedly. Idle speed is smooth and under load while mowing is smooth. Also notice the same every 3 second pattern while standing still at full throttle, but more noticeable going downhill. It's almost like the engine is not getting fuel or power to plugs every three seconds, but is not noticed while going up hill or mowing.
Any thoughts?
Any thoughts?